Scanner::peek() - Code Metrics - arthurkushman/querypath - Measure and Improve Code Quality continuously with Scrutinizer

Scanner::peek() A
last analyzed 2022-03-28 08:12 UTC

↳ Parent: Scanner

Complexity

Conditions	1
Paths	1

Size

Total Lines	3
Code Lines	1

Duplication

Lines	0
Ratio	0 %

Importance

Changes

Metric	Value
cc	1
eloc	1
nc	1
nop	0
dl	0
loc	3
rs	10
c	0
b	0
f	0

<?php
/** @file
 * The scanner.
 */

namespace QueryPath\CSS;

/**
 * Scanner for CSS selector parsing.
 *
 * This provides a simple scanner for traversing an input stream.
 *
 * @ingroup querypath_css
 */
final class Scanner
{

    public $is;
    public $value;
    public $token;

    public $recurse = false;
    public $it = 0;

    /**
     * Given a new input stream, tokenize the CSS selector string.
     *
     * @see InputStream
     * @param InputStream $in
     *  An input stream to be scanned.
     */
    public function __construct(InputStream $in)
    {
        $this->is = $in;
    }

    /**
     * Return the position of the reader in the string.
     */
    public function position(): int
    {
        return $this->is->position;
    }

    /**
     * See the next char without removing it from the stack.
     *
     * @return string
     * Returns the next character on the stack.
     */
    public function peek(): string
    {
        return $this->is->peek();
    }

    /**
     * Get the next token in the input stream.
     *
     * This sets the current token to the value of the next token in
     * the stream.
     *
     * @return int
     *  Returns an int value corresponding to one of the Token constants,
     *  or FALSE if the end of the string is reached. (Remember to use
     *  strong equality checking on FALSE, since 0 is a valid token id.)
     * @throws ParseException
     * @throws \QueryPath\Exception
     */
    public function nextToken(): int
    {
        $tok = -1;
        ++$this->it;
        if ($this->is->isEmpty()) {
            if ($this->recurse) {
                throw new \QueryPath\Exception('Recursion error detected at iteration ' . $this->it . '.');
            }
            //print "{$this->it}: All done\n";
            $this->recurse = true;
            $this->token = false;

            return false;

        }
        $ch = $this->is->consume();
        //print __FUNCTION__ . " Testing $ch.\n";
        if (ctype_space($ch)) {
            $this->value = ' '; // Collapse all WS to a space.
            $this->token = $tok = Token::WHITE;

            //$ch = $this->is->consume();
            return $tok;
        }

        if ($ch === '-' || $ch === '_' || ctype_alnum($ch)) {
            // It's a character
            $this->value = $ch; //strtolower($ch);
            $this->token = $tok = Token::CHAR;

            return $tok;
        }

        $this->value = $ch;

        switch ($ch) {
            case '*':
                $tok = Token::STAR;
                break;
            case chr(ord('>')):
                $tok = Token::RANGLE;
                break;
            case '.':
                $tok = Token::DOT;
                break;
            case '#':
                $tok = Token::OCTO;
                break;
            case '[':
                $tok = Token::LSQUARE;
                break;
            case ']':
                $tok = Token::RSQUARE;
                break;
            case ':':
                $tok = Token::COLON;
                break;
            case '(':
                $tok = Token::LPAREN;
                break;
            case ')':
                $tok = Token::RPAREN;
                break;
            case '+':
                $tok = Token::PLUS;
                break;
            case '~':
                $tok = Token::TILDE;
                break;
            case '=':
                $tok = Token::EQ;
                break;
            case '|':
                $tok = Token::PIPE;
                break;
            case ',':
                $tok = Token::COMMA;
                break;
            case chr(34):
                $tok = Token::QUOTE;
                break;
            case "'":
                $tok = Token::SQUOTE;
                break;
            case '\\':
                $tok = Token::BSLASH;
                break;
            case '^':
                $tok = Token::CARAT;
                break;
            case '$':
                $tok = Token::DOLLAR;
                break;
            case '@':
                $tok = Token::AT;
                break;
        }


        // Catch all characters that are legal within strings.
        if ($tok === -1) {
            // TODO: This should be UTF-8 compatible, but PHP doesn't
            // have a native UTF-8 string. Should we use external
            // mbstring library?

            $ord = ord($ch);
            // Characters in this pool are legal for use inside of
            // certain strings. Extended ASCII is used here, though I
            // Don't know if these are really legal.
            if (($ord >= 32 && $ord <= 126) || ($ord >= 128 && $ord <= 255)) {
                $tok = Token::STRING_LEGAL;
            } else {
                throw new ParseException('Illegal character found in stream: ' . $ord);
            }
        }

        $this->token = $tok;

        return $tok;
    }

    /**
     * Get a name string from the input stream.
     * A name string must be composed of
     * only characters defined in Token:char: -_a-zA-Z0-9
     */
    public function getNameString()
    {
        $buf = '';
        while ($this->token === Token::CHAR) {
            $buf .= $this->value;
            $this->nextToken();
        }

        return $buf;
    }

    /**
     * This gets a string with any legal 'string' characters.
     * See CSS Selectors specification, section 11, for the
     * definition of string.
     *
     * This will check for string1, string2, and the case where a
     * string is unquoted (Oddly absent from the "official" grammar,
     * though such strings are present as examples in the spec.)
     *
     * Note:
     * Though the grammar supplied by CSS 3 Selectors section 11 does not
     * address the contents of a pseudo-class value, the spec itself indicates
     * that a pseudo-class value is a "value between parenthesis" [6.6]. The
     * examples given use URLs among other things, making them closer to the
     * definition of 'string' than to 'name'. So we handle them here as strings.
     */
    public function getQuotedString()
    {
        if ($this->token === Token::QUOTE || $this->token === Token::SQUOTE || $this->token === Token::LPAREN) {
            $end = ($this->token === Token::LPAREN) ? Token::RPAREN : $this->token;
            $buf = '';
            $escape = false;

            $this->nextToken(); // Skip the opening quote/paren

            // The second conjunct is probably not necessary.
            while ($this->token !== false && $this->token > -1) {
                //print "Char: $this->value \n";
                if ($this->token == Token::BSLASH && !$escape) {
                    // XXX: The backslash (\) is removed here.
                    // Turn on escaping.
                    //$buf .= $this->value;
                    $escape = true;
                } elseif ($escape) {
                    // Turn off escaping
                    $buf .= $this->value;
                    $escape = false;
                } elseif ($this->token === $end) {
                    // At end of string; skip token and break.
                    $this->nextToken();
                    break;
                } else {
                    // Append char.
                    $buf .= $this->value;
                }
                $this->nextToken();
            }

            return $buf;
        }
    }

    // Get the contents inside of a pseudoClass().
    public function getPseudoClassString()
    {
        if ($this->token === Token::QUOTE || $this->token === Token::SQUOTE || $this->token === Token::LPAREN) {
            $end = ($this->token === Token::LPAREN) ? Token::RPAREN : $this->token;
            $buf = '';
            $escape = false;

            $this->nextToken(); // Skip the opening quote/paren

            // The second conjunct is probably not necessary.
            while ($this->token !== false && $this->token > -1) {
                //print "Char: $this->value \n";
                if ($this->token === Token::BSLASH && !$escape) {
                    // XXX: The backslash (\) is removed here.
                    // Turn on escaping.
                    //$buf .= $this->value;
                    $escape = true;
                } elseif ($escape) {
                    // Turn off escaping
                    $buf .= $this->value;
                    $escape = false;
                } // Allow nested pseudoclasses.
                elseif ($this->token === Token::LPAREN) {
                    $buf .= '(';
                    $buf .= $this->getPseudoClassString();
                    $buf .= ')';
                } elseif ($this->token === $end) {
                    // At end of string; skip token and break.
                    $this->nextToken();
                    break;
                } else {
                    // Append char.
                    $buf .= $this->value;
                }
                $this->nextToken();
            }

            return $buf;
        }
    }

    /**
     * Get a string from the input stream.
     * This is a convenience function for getting a string of
     * characters that are either alphanumber or whitespace. See
     * the Token::white and Token::char definitions.
     *
     * @deprecated This is not used anywhere in QueryPath.
     *//*
  public function getStringPlusWhitespace() {
    $buf = '';
    if($this->token === FALSE) {return '';}
    while ($this->token === Token::char || $this->token == Token::white) {
      $buf .= $this->value;
      $this->nextToken();
    }
    return $buf;
  }*/

}


1			<?php
2			/** @file
3			* The scanner.
4			*/
5
6			namespace QueryPath\CSS;
7
8			/**
9			* Scanner for CSS selector parsing.
10			*
11			* This provides a simple scanner for traversing an input stream.
12			*
13			* @ingroup querypath_css
14			*/
15			final class Scanner
16			{
17
18			public $is;
19			public $value;
20			public $token;
21
22			public $recurse = false;
23			public $it = 0;
24
25			/**
26			* Given a new input stream, tokenize the CSS selector string.
27			*
28			* @see InputStream
29			* @param InputStream $in
30			* An input stream to be scanned.
31			*/
32			public function __construct(InputStream $in)
33			{
34			$this->is = $in;
35			}
36
37			/**
38			* Return the position of the reader in the string.
39			*/
40			public function position(): int
41			{
42			return $this->is->position;
43			}
44
45			/**
46			* See the next char without removing it from the stack.
47			*
48			* @return string
49			* Returns the next character on the stack.
50			*/
51			public function peek(): string
52			{
53			return $this->is->peek();
54			}
55
56			/**
57			* Get the next token in the input stream.
58			*
59			* This sets the current token to the value of the next token in
60			* the stream.
61			*
62			* @return int
63			* Returns an int value corresponding to one of the Token constants,
64			* or FALSE if the end of the string is reached. (Remember to use
65			* strong equality checking on FALSE, since 0 is a valid token id.)
66			* @throws ParseException
67			* @throws \QueryPath\Exception
68			*/
69			public function nextToken(): int
70			{
71			$tok = -1;
72			++$this->it;
73			if ($this->is->isEmpty()) {
74			if ($this->recurse) {
75			throw new \QueryPath\Exception('Recursion error detected at iteration ' . $this->it . '.');
76			}
77			//print "{$this->it}: All done\n";
78			$this->recurse = true;
79			$this->token = false;
80
81			return false;
			0 ignored issues – show Bug Best Practice introduced 2018-08-02 20:47 UTC by Report Bug Copy Issue Report The expression `return false` returns the type `false` which is incompatible with the type-hinted return `integer`. Loading history...
82			}
83			$ch = $this->is->consume();
84			//print __FUNCTION__ . " Testing $ch.\n";
85			if (ctype_space($ch)) {
86			$this->value = ' '; // Collapse all WS to a space.
87			$this->token = $tok = Token::WHITE;
88
89			//$ch = $this->is->consume();
90			return $tok;
91			}
92
93			if ($ch === '-' \|\| $ch === '_' \|\| ctype_alnum($ch)) {
94			// It's a character
95			$this->value = $ch; //strtolower($ch);
96			$this->token = $tok = Token::CHAR;
97
98			return $tok;
99			}
100
101			$this->value = $ch;
102
103			switch ($ch) {
104			case '*':
105			$tok = Token::STAR;
106			break;
107			case chr(ord('>')):
108			$tok = Token::RANGLE;
109			break;
110			case '.':
111			$tok = Token::DOT;
112			break;
113			case '#':
114			$tok = Token::OCTO;
115			break;
116			case '[':
117			$tok = Token::LSQUARE;
118			break;
119			case ']':
120			$tok = Token::RSQUARE;
121			break;
122			case ':':
123			$tok = Token::COLON;
124			break;
125			case '(':
126			$tok = Token::LPAREN;
127			break;
128			case ')':
129			$tok = Token::RPAREN;
130			break;
131			case '+':
132			$tok = Token::PLUS;
133			break;
134			case '~':
135			$tok = Token::TILDE;
136			break;
137			case '=':
138			$tok = Token::EQ;
139			break;
140			case '\|':
141			$tok = Token::PIPE;
142			break;
143			case ',':
144			$tok = Token::COMMA;
145			break;
146			case chr(34):
147			$tok = Token::QUOTE;
148			break;
149			case "'":
150			$tok = Token::SQUOTE;
151			break;
152			case '\\':
153			$tok = Token::BSLASH;
154			break;
155			case '^':
156			$tok = Token::CARAT;
157			break;
158			case '$':
159			$tok = Token::DOLLAR;
160			break;
161			case '@':
162			$tok = Token::AT;
163			break;
164			}
165
166
167			// Catch all characters that are legal within strings.
168			if ($tok === -1) {
169			// TODO: This should be UTF-8 compatible, but PHP doesn't
170			// have a native UTF-8 string. Should we use external
171			// mbstring library?
172
173			$ord = ord($ch);
174			// Characters in this pool are legal for use inside of
175			// certain strings. Extended ASCII is used here, though I
176			// Don't know if these are really legal.
177			if (($ord >= 32 && $ord <= 126) \|\| ($ord >= 128 && $ord <= 255)) {
178			$tok = Token::STRING_LEGAL;
179			} else {
180			throw new ParseException('Illegal character found in stream: ' . $ord);
181			}
182			}
183
184			$this->token = $tok;
185
186			return $tok;
187			}
188
189			/**
190			* Get a name string from the input stream.
191			* A name string must be composed of
192			* only characters defined in Token:char: -_a-zA-Z0-9
193			*/
194			public function getNameString()
195			{
196			$buf = '';
197			while ($this->token === Token::CHAR) {
198			$buf .= $this->value;
199			$this->nextToken();
200			}
201
202			return $buf;
203			}
204
205			/**
206			* This gets a string with any legal 'string' characters.
207			* See CSS Selectors specification, section 11, for the
208			* definition of string.
209			*
210			* This will check for string1, string2, and the case where a
211			* string is unquoted (Oddly absent from the "official" grammar,
212			* though such strings are present as examples in the spec.)
213			*
214			* Note:
215			* Though the grammar supplied by CSS 3 Selectors section 11 does not
216			* address the contents of a pseudo-class value, the spec itself indicates
217			* that a pseudo-class value is a "value between parenthesis" [6.6]. The
218			* examples given use URLs among other things, making them closer to the
219			* definition of 'string' than to 'name'. So we handle them here as strings.
220			*/
221			public function getQuotedString()
222			{
223			if ($this->token === Token::QUOTE \|\| $this->token === Token::SQUOTE \|\| $this->token === Token::LPAREN) {
224			$end = ($this->token === Token::LPAREN) ? Token::RPAREN : $this->token;
225			$buf = '';
226			$escape = false;
227
228			$this->nextToken(); // Skip the opening quote/paren
229
230			// The second conjunct is probably not necessary.
231			while ($this->token !== false && $this->token > -1) {
232			//print "Char: $this->value \n";
233			if ($this->token == Token::BSLASH && !$escape) {
234			// XXX: The backslash (\) is removed here.
235			// Turn on escaping.
236			//$buf .= $this->value;
237			$escape = true;
238			} elseif ($escape) {
239			// Turn off escaping
240			$buf .= $this->value;
241			$escape = false;
242			} elseif ($this->token === $end) {
243			// At end of string; skip token and break.
244			$this->nextToken();
245			break;
246			} else {
247			// Append char.
248			$buf .= $this->value;
249			}
250			$this->nextToken();
251			}
252
253			return $buf;
254			}
255			}
256
257			// Get the contents inside of a pseudoClass().
258			public function getPseudoClassString()
259			{
260			if ($this->token === Token::QUOTE \|\| $this->token === Token::SQUOTE \|\| $this->token === Token::LPAREN) {
261			$end = ($this->token === Token::LPAREN) ? Token::RPAREN : $this->token;
262			$buf = '';
263			$escape = false;
264
265			$this->nextToken(); // Skip the opening quote/paren
266
267			// The second conjunct is probably not necessary.
268			while ($this->token !== false && $this->token > -1) {
269			//print "Char: $this->value \n";
270			if ($this->token === Token::BSLASH && !$escape) {
271			// XXX: The backslash (\) is removed here.
272			// Turn on escaping.
273			//$buf .= $this->value;
274			$escape = true;
275			} elseif ($escape) {
276			// Turn off escaping
277			$buf .= $this->value;
278			$escape = false;
279			} // Allow nested pseudoclasses.
280			elseif ($this->token === Token::LPAREN) {
281			$buf .= '(';
282			$buf .= $this->getPseudoClassString();
283			$buf .= ')';
284			} elseif ($this->token === $end) {
285			// At end of string; skip token and break.
286			$this->nextToken();
287			break;
288			} else {
289			// Append char.
290			$buf .= $this->value;
291			}
292			$this->nextToken();
293			}
294
295			return $buf;
296			}
297			}
298
299			/**
300			* Get a string from the input stream.
301			* This is a convenience function for getting a string of
302			* characters that are either alphanumber or whitespace. See
303			* the Token::white and Token::char definitions.
304			*
305			* @deprecated This is not used anywhere in QueryPath.
306			//
307			public function getStringPlusWhitespace() {
308			$buf = '';
309			if($this->token === FALSE) {return '';}
310			while ($this->token === Token::char \|\| $this->token == Token::white) {
311			$buf .= $this->value;
312			$this->nextToken();
313			}
314			return $buf;
315			}*/
316
317			}
318

arthurkushman / querypath

Scanner::peek() A last analyzed 2022-03-28 08:12 UTC

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Scanner::peek() A
last analyzed 2022-03-28 08:12 UTC